Die for eccentric bolt cold heading machining

Abstract

The invention relates to a die for eccentric bolt cold heading machining. The die comprises a lower die body and an upper die body, the upper die body is connected with a driving device and comprises a first stamping upper die, a second stamping upper die and an edge cutting upper die, and the lower die body comprises a first stamping lower die, a second stamping lower die and an edge cutting lower die which correspond to the first stamping upper die, the second stamping upper die and the edge cutting upper die of the upper die body in sequence; a first molding groove is formed in the lower portion of the first stamping upper die, an eccentric modeling cavity is formed in the position of an opening of the first molding groove, a hexagon modeling cavity is formed in the bottom of the first molding groove, and the connecting line of one set of opposite angles of an overlook projection of the hexagon modeling cavity is collinear with the protruding direction of the eccentric modeling cavity; and a first positioning groove is formed in the upper portion of the first stamping lower die, a second molding groove is formed in the lower portion of the second stamping upper die, a second positioning groove is formed in the upper portion of the second stamping lower die, a positioning part is arranged at the lower portion of the edge cutting upper die, the side face of the positioning part is sleeved with an annular edge cutting die body, and an edge cutting die positioning groove is formed in the upper portion of the edge cutting lower die. The die has the beneficial effects that the structure is simple, the manufacturing cost is low, the production stability is high, and the finished product quality can be effectively guaranteed.

Description

technical field [0001] The invention relates to the field of part processing, in particular to a mold for cold heading processing of eccentric bolts. Background technique [0002] There is an existing Chinese invention patent with the patent number CN201510768427.0 titled "A Cold Heading Process for Chassis Eccentric Nuts and Die Structure for Forming Special-shaped Holes", which discloses a cold heading process for chassis eccentric nuts: shearing wire; Shaping; upsetting hexagonal and stretched holes; pre-upsetting eccentric flange for the first time; second pre-upsetting eccentric flange; forming eccentric flange; forming special-shaped holes. The mold for forming special-shaped holes includes a main mold unit and a punching die unit. The main mold unit includes a main mold shell, a main mold inner mold, a main mold inner pad, a main mold thimble and a main mold ejector pin, and a punching mold unit includes a punching mold shell and a punching mold pad. And the die thim...

AI Technical Summary

Problems solved by technology

However, the structure of the mold structure is complex, the production cost is high, and the production stability is poor when using the mold, and the quality of the finished product cannot be effectively guaranteed, so the mold structure needs further improvement

Images